JPH0347817Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Many tools and other devices have been constructed and used to grind valve seats in equipment such as internal combustion engines. Known devices are widely used with varying degrees of difficulty, accuracy and success. However, the accuracy and characteristics of engine valve seats are critical to engine operating efficiency, and even small defects can result in compression leakage and loss, which adversely affects engine efficiency and causes seat deterioration and wear. known for a long time.

One of the main problems with known valve seat grinding tools is that the grinding part, the abrasive part, is itself subject to relatively considerable wear, deformation and fracture during grinding. This is because the abrasive parts of the known devices have a relatively short lifespan, their shapes are subject to deformation during use and wear-out, and they require relatively frequent refurbishing to restore their shape. This means that they are normally operated dry which creates dust and debris which adversely affects the accuracy of the grinding operation. Reconditioning of abrasive members is particularly troublesome and is generally necessary for two separate reasons. First, when a conventional grinding wheel is bonded hard enough to maintain its shape, this bond displaces dull abrasive grains and prevents sharp abrasive grains from coming to the surface. Dull grinding wheels also tend to require high cutting forces, which in turn leaves eccentricity between the valve guide and valve seat. In other words, the pilot arbor tends to bend under high cutting forces, which is often a serious drawback. In this case, reshaping is necessary to restore sharp abrasive grains to the cut surface.

Second, if a conventional grinding wheel is bonded soft enough to expel the dull abrasive grains and bring the sharp abrasive grains to the surface, the wheel wears very quickly and loses its shape. The desired valve seat profile then deteriorates and requires resurfacing to restore the vehicle to its intended shape.

In either case, the necessary reshaping is time consuming and since reshaping removes more of the wheel than would normally wear out during the grinding operation, it significantly shortens the life of the wheel. Touch-up also creates a dusty, damp environment that is hazardous to health. These and other disadvantages and shortcomings of the known devices arise when grinding a plurality of valve seats, when moving from grinding one set of valve seats to another, and also when grinding different sets of the same valve seat. This is magnified by the fact that frequent changes and adjustments are usually necessary when changing from grinding surfaces.

The present invention proposes an improved construction and operation of a valve seat grinding device that overcomes the shortcomings and disadvantages of the known devices mentioned above. In particular, the present invention utilizes a novel abrasive member for grinding valve seats and similar surfaces. Such parts are thinly covered parts,
Preferably, the component is accurately overlaid with a material containing particles with extremely hard wear-resistant properties, such as diamond particles, cubic boron nitride particles, and certain other materials. Once such material is applied thinly to the workpiece-engaging portion of the device, the device will never need to be refurbished to maintain its accuracy, and they will generate little or no dust during the grinding process. A novel device for supporting and precisely guiding the abrasive members so that they maintain alignment and positional accuracy during operation can be operated while in a wet or oily environment to prevent They can be used in conjunction, they yield relatively fast material removal rates, and the valve seat surfaces ground by the present device have minimal material removed from them and they have excellent surface accuracy. surface properties and eliminates the need to prepare the surface in advance with a rough grinding wheel, as was often required in the past. This arrangement also allows the polishing member to be quickly and easily changed so that a set of valve seats can be accurately ground with a minimum amount of time and effort. Furthermore, if the engine has to be subjected to other machining when grinding the valve seat, such as rebuilding the cylinder bore or the valve guide in which the valve stem moves, the present invention is suitable for wet operation, although this is not necessary. The fact that the engine may already be wet will not interfere with the operation of the present valve seat grinding device, as it is preferred to do so. As previously mentioned, grinding the valve seat while wet reduces or eliminates the generation of dust and other particles, including abrasive particles, which is one of the benefits. In addition, this device generates little or no free abrasive particles during operation.
This depends on the hardness of the particles used in the polishing layer and the conditions in which the polishing layer is made and applied. Additionally, the polished member produces excellent runout characteristics, which are a measure of the roundness and concentricity of the valve seat surface after grinding, which is an important advantage that contributes to the accuracy and sealing properties of the ground valve seat. be.

The present invention uses a novel abrasive member configuration and relates to an improved apparatus for supporting, guiding and driving the abrasive member. This device uses a guide member that is temporarily installed within the valve guide. Furthermore,
The improved device can be powered by a readily available power source, such as a portable hand tool such as an electric drill, and the power source can be powered by a portable hand tool, such as an electric drill, to drive the subject abrasive member. The abrasive member can be connected via a coupling connection device that allows free relative angular movement between the device and the device to which it is attached. The use of such a coupling device avoids binding, allows freer and less stiff working, and contributes to accuracy, including improved runout of the surface being ground.

An important object of the invention is to provide a more accurate device for grinding valve seats and similar surfaces.

Another object is to provide a grinding device which has relatively long life characteristics and which does not require periodic refurbishment to maintain the accuracy of its grinding surface.

Another purpose is to enable wet grinding of valve seats.

Another object is to substantially reduce or eliminate contamination of the engine with dust, abrasive particles, and other foreign matter during grinding of the engine valve seats.

Another objective is to significantly reduce or completely eliminate the need for rough grinding of the valve seat.

Another purpose is to reduce the time and effort required to grind valve seats on equipment such as engines.

Another object is to provide an improved apparatus for coupling a power source to a rotatable tool used for grinding valve seats.

Another object is to provide a valve seat grinding tool that produces improved runout characteristics of the ground valve seat.

Another object is to reduce the time and effort required to replace the grinding members used to grind different faces of the valve seat.

Another purpose is to increase the operating efficiency of the internal combustion engine.

Another objective is to reduce the time and effort required to prepare an engine for valve seat grinding.

Another object is to provide an abrasive valve seat grinding member having a cutting surface formed of discrete sections arranged in such a manner as to improve working accuracy and cutting efficiency.

Another object is to provide a relatively small, portable valve seat grinding tool that can be combined for use with existing power sources such as electric drills.

Another object is to facilitate the replacement of the grinding member of the valve seat grinding tool.

To achieve these objectives, a tool for grinding valve seats of engines, etc. according to the present invention comprises an inner part and an outer part placed between them to enable relative rotational movement between them. a support structure having a bearing arrangement, a guide member for mounting extending outwardly from a valve seat to be ground into position within the valve guide, the first portion being located in the valve guide and the guide member extending from the valve guide and being ground; a guide member having a cylindrical portion positioned to extend through the valve seat and associated surfaces to be slidably engaged with the cylindrical portion of the guide member to permit axial movement therealong; an annular metal member having axially spaced end faces and a cylindrical outer surface therebetween, one of the end faces having a frusto-conical shape; an annular metal member contoured to the desired shape of the valve seat surface to be ground by, said one end surface having a plurality of spaced apart surface grooves and an adjacent surface portion formed therein; a work-engaging surface layer made of a relatively hard wear-resistant material and a bond formed on said one end surface of the member, including a device for attaching and aligning the metal member to said outer support; has spaced apart ends, one of which includes a device coupled to a drive source to rotate the outer member relative to the inner member, and the other end attaches and aligns the metal member thereto for rotation with the outer support. The system includes a device for in this way,
The device of the present invention includes a metal grinding member having a frusto-conical end face with a plurality of surface grooves and a surface layer of relatively hard wear-resistant material, which facilitates tool fabrication and eliminates the need for expensive diamond The amount of abrasive materials such as particles and cubic boron nitride particles can be significantly reduced, and many surfaces of the valve seat can be precisely ground, and the tool life is long and the large amount of valve seats can be removed. It has advantages such as being suitable for production.

Further, a polishing member for polishing a valve seat surface according to the present invention includes an annular metal member having an axially extending central through passage, the metal member having axially opposing annular end surfaces thereon, one face of which is oriented at an acute angle to the axis of the member thereby forming a frusto-conical end face having a contour that matches the contour of the valve seat surface to be ground; is formed by spaced apart surfaces having an inner circumferential edge and an outer circumferential edge and extending between the inner circumferential edge and the outer circumferential edge; The workpiece-engaging surface layer is made of particles of a hard, wear-resistant material and a binder for engaging and abrading the valve seat surface to be ground. This configuration simplifies fabrication of the abrasive member and eliminates the need for expensive abrasive materials by forming the work-engaging surface layer on selected surfaces of a plurality of separate surfaces on the frusto-conical end face. It has the advantage of reducing usage.

Further, an abrasive member for use in grinding an annular frusto-conical valve seat surface of an engine according to the present invention includes an annular member having an axial passage therethrough and axially opposing surfaces, at least the opposing surfaces of the annular member. a portion of one of the surfaces is frustoconical and oriented at an acute angle corresponding to the desired direction of the frustoconical valve seat surface to be ground thereby with respect to the axis of the member;
the abrasive member further includes a plurality of circumferentially spaced surface portions and a surface groove extending along both sides of each of the spaced surface portions; a work-engaging layer formed by particles of a relatively hard wear-resistant material and a binder formed on selected surfaces of the metal member and thereby engaging a ground valve seat surface; The metal member includes an apparatus including an axial passageway through the metal member for rotationally mounting the metal member about its axis. In this manner, the workpiece-engaging layer of particles of hard wear-resistant material forms surface grooves extending along both sides of each of the circumferentially spaced surfaces, and the valve seat surfaces engage the selected surfaces. The surface portion is a surface portion having a workpiece-engaging layer of particles of hard wear-resistant material thereon, and has an axial passageway therethrough for attaching the metal member to the abrasive member. Easy installation, more accurate grinding, surface grooves facilitate circulation of lubricant or coolant, and easy removal of grinding debris removed during grinding. It has the advantage of being able to

Further, a tool for grinding an annular frusto-conical valve seat surface according to the present invention includes an elongated housing member having spaced apart opposing ends and a chamber extending therebetween, the tool being at one end of the housing member and rotating. an annular abrasive member and a device at the other end of the housing member for attaching an abrasive member thereto, the abrasive member being made of metal and the angle of the valve seat surface to be ground; an annular frusto-conical surface formed at one end thereof at an angle corresponding to the direction, and at least two spaced apart portions formed to extend across the annular frusto-conical surface at spaced apart locations thereabout; a layer of relatively hard wear-resistant abrasive particles and a bonding agent formed on the frusto-conical surface to engage the valve seat surface to be ground, and a metal abrasive member attached thereto. The apparatus includes means for supporting the housing member in a position such that the layer of abrasive particles engages the valve seat surface to be ground. With this construction, the tool has, in addition to the advantages of the device of the invention described above, the housing having a device at one end for connection to a source of rotational energy and a device at the other end for attaching the abrasive member. There are advantages to forming a special housing.

Furthermore, the apparatus for grinding an annular frustoconical valve seat surface according to the present invention includes a housing structure having first and second parts rotatable relative to each other and spaced apart opposing first and second ends. a device at the first end for coupling the first housing portion to a source of rotational energy; an axially extending hole defined in part by the threaded portion and in part by an annular groove adjacent one end thereof; an annular metal abrasive member having a threaded portion for cooperating with a threaded hole portion of the abrasive member and an annular portion for cooperating simultaneously with an annular groove; has a frusto-conical end surface made thereon at an angle corresponding to the angular direction of the valve seat surface to be ground, the frusto-conical end surface extending between spaced apart inner and outer peripheral edges; a plurality of circumferentially spaced grooves extending between the spaced apart peripheries and dividing the surface into a plurality of surface portions; a layer of relatively hard, wear-resistant abrasive particles and a bonding agent formed over the surface of the abrasive material. In this manner, the tool is provided with a housing threaded portion that cooperates with the threaded hole portion of the abrasive member and an annular portion that cooperates with the annular groove of the abrasive member, so that the abrasive member can be accurately and easily placed in the housing. There are advantages.

Next, embodiments of the present invention will be described with reference to the drawings.

Referring more particularly to the drawings by reference numerals, numeral 20 in FIGS. 1 and 2 refers to a tool for use in grinding annular surfaces, such as, for example, an annular tapered seating surface of a valve seat of an internal combustion engine. The tool 20, as shown in FIG. 2, includes an elongated cylindrical housing 22 (FIG. 5) having a small diameter end 24 with external threads 26. The housing 22 also has an annular orientation shoulder 27 and an end surface 29 extending outwardly from the shoulder 27 at right angles to the housing axis. Threads 26 cooperate with threads 28 formed on the inner surface of an annular work-engaging abrasive member 30 (see, for example, FIGS. 7, 10, 11, and 12). This member 3
The inner surface of 0 also has a bore 31 that engages shoulder 27 when the member 30 is installed to align the countersink axis of this member 30 with the housing 22. When this member 30 is fully installed, it also abuts the housing end face 29 to maintain itself in the proper installed position within the housing. Washer 33 (Figure 5)
may be provided if necessary. This member 30
The details are important to the invention and several different embodiments are described below.

The housing 22 includes a pair of separate bearing assemblies 32.
and 34 whose outer races engage the inner surface of the housing 22 and whose inner races include an elongated tubular member 36.
engages the outer surface of the The annular space 37 is the housing 2
2. Member 36 and separate bearing assemblies 32 and 34
made between them by. This space 37 may be filled with a plurality of shots or similar elements 39 or with a viscous fluid or a combination thereof to increase the moment of inertia in order to improve the operating characteristics of the device by reducing unwanted vibrations. is usually preferred. The member 36 is a guide member 42 (FIG. 6)
It has a cylindrical inner surface 38 sized to slidably cooperate with the cylindrical end 40 of the. This guide member 42 is
It typically has an opposite end 44 which is somewhat smaller in diameter than end 40 and sized to be placed in the valve guide of the engine block or head associated with the valve seat to be ground by the subject apparatus. This member 42
Therefore, during the grinding operation, the workpiece engaging member 3
0, and in particular is used as a guide for movably supporting and accurately positioning the workpiece engaging surface 46.

In the configuration shown in FIG. 2, the abrasive member 30 threadably engages the threads 26 in the small diameter housing portion, and during this installation, the shoulder 27 is provided with a recess 31 for aligning the member 30 thereon as previously described. slidingly cooperates with. During operation of this device, the small diameter section 2
Housing 22 , including 4 and abrasive member 30 screwed thereto, rotates relative to inner tubular member 36 . A drive for actuating the subject device is coupled thereto by member 48 (FIGS. 2-5), which includes a hexagonal head 50 and an elongated body 5.
It has 2. The head 50 has a rounded end surface 54 and is positioned within a hexagonal socket 56 provided therefor in a housing closure 58 attached to one end of the tubular housing 22. This attachment is accomplished by an annular flange 60 that fits into the housing 22 and is secured by suitable devices, such as threads 62.

Hexagonal cavity or socket 56 also receives an annular elastomeric washer 64 to which rounded end surface 54 engages. The end of the device 20 is closed by an annular closing wall 66, which wall 66 is connected to the cylindrical portion 7 of the member 48.
It has a central opening 68 large enough to cooperatively receive the hex head 50 but does not pass through it. Member 48 is connected to housing members 22, 24, 58 and 6.
To be able to make a certain limited angular movement relative to 6,
Some clearance should be provided between this opening 68 and the portion 70.

As shown in FIGS. 2 and 3, the member 48 is attached to the chuck portion 7 of an electric drill 74 as shown in FIG.
It is shaped to be coupled to a driving source such as 2. The shape of the end of this member 48 opposite the hexagonal head 50 allows for quick connection and release.
Some relative angular movement is possible between the drill 74 and the device 20 when so coupled.
This is important and useful for this operation by preventing binding while maintaining alignment between the member 30 and the valve seat surface being ground thereby. This limited free movement also eliminates rigidity between the drill and the tool 20, excluding the member 48 fixed to the drill.
In addition, the run-out characteristics of the surface to be ground are greatly improved.
As previously mentioned, during operation the device 20 is slidably engaged with the cylindrical end 40 of the guide member 42, while the opposite or lower end 44 of the guide member 42 is connected to the valve of the head 76 as shown in FIG. It is fixed in place in the guide. If there is no free play between the tool and the power source, there will be a tendency to increase the possibility of unnecessary stiffness or stiffness as well as vibrations of this tool, which will adversely affect the surface accuracy and runout characteristics of the valve seat being ground. right.

Referring again to FIG. 1, the entire assembly 80 is shown in operation and coupled to a support ring assembly 82 with a handle 84 for support and guidance control as shown, and a nozzle assembly 90. and includes a device attached thereto for supporting a lubricating tube 86 leading to a flexible tubular outlet end 88 . This tube 8
6 and portions 88 and 90 provide a means for directing a flow of lubricant, such as a flow of cutting oil, to the grinding area. As far as is known, no prior methods have involved wetting the ground valve seat, and therefore known configurations reduce dust and the potential for it to enter the engine and cause operational problems such as engine wear. This causes considerable stone and component wear that results in some abrasive particles and other foreign matter. However, this is not a problem with the present device because it removes considerably less material from the part being ground and, as will be explained in more detail below, produces little or no dust or abrasive member dust, and With this device, it is usually unnecessary to use a roughing step prior to final dimensioning and finishing operations.

Referring again to FIG. 2, when member 48 is coupled to drill 74 as shown in FIG. transmitted to member 30. Forward or forward pressure applied from the drill 74 is applied to the annular washer 64 through the rounded surface 54 of the head 50. This provides a smooth operating connection with some cushioning and allows some limited angular movement of the drill relative to the tool 20 to prevent stiffness or stiffness between the power source and the guide member 42. The inner tubular member 36 is slidably attached to the cylindrical end 40 of the guide 42, and this movement may be non-rotating and primarily involves the abrasive member moving axially along the guide 42 and the valve seat surface being ground. It serves to accurately position, align and position it when engaged. Bearing assemblies 32 and 34
allows for relative rotational movement between the housing 22 containing the abrasive member 30 and the tubular member 36, and also allows for the abrasive force to reach it as the abrasive member 30 is rotated and moved axially into engagement with the valve seat. enable.

In FIG. 5, the parts of this assembly 20 are shown in an exploded view for ease of understanding and to better illustrate the assembled state of the parts. The various parts shown in FIG. 5 are numbered to correspond to the same parts shown in other figures.

Illustrated in FIG. 6 is a typical form of guide member 42, which has one end 44 for positioning in the valve guide and axially within the cylindrical inner surface 38 of tubular member 36 when the apparatus of the present invention is in use. and an opposite end 40 which allows movement. Portion 44 may be slightly tapered from end to end to allow for a secure connection when inserted into the stem hole;
0 is cylindrical in shape to facilitate relatively free axial movement of the device 20 therealong. As shown in FIG. 6, the cylindrical portion 40 has a lateral hole 92 extending therethrough near its end through which a lever or rod member (not shown) can be inserted.
When placed in the valve guide, it can be used to rotate it so that there is an interference fit. This same lever or bar can also be used to unscrew member 42 so that it can be easily pulled out after it has served its purpose. The shape and size of this guide member 42, as well as other parts, can all be varied depending on the size of the valve guide and the size of the valve seat to be ground.

Important to the present invention are the structural details of the abrasive member 30. Several different embodiments of this member 30 are shown and discussed, including embodiments used to grind different angular portions of the valve seat. Many valve seats are made with three adjacent surfaces to be ground, all at different angles. In order to grind the structure as such, it is important to grind each different facet, and this will require several different grinding operations to complete the grinding. This also requires the use of several different abrasive members that can be distinguished from each other by having abrasive surfaces oriented at different angles. A typical valve seat 78 to be ground is shown in FIG. The valve seat 78 is formed with three annular surfaces that are shown oriented at a relatively shallow angle, such as 30 degrees, to the axis of the valve seat; an annular inner surface 94;
A second annular seat 96 is shown oriented at 45° to the axis and is the valve seat that engages the engine valve member during operation, and 60° (or 75°) to the axis.
including a third outer annular seat 98 shown as being oriented at a steep angle such as . 1st
Figure 6 also illustrates a portion of the valve guide 100 in which portion 44 of guide member 42 is located during operation of the subject tool.

To grind the valve seat 78 of FIG.
It is necessary to use two different abrasive members. However, each of the different abrasive members is designed to be used in a series of operations using the same guide member 42 and with the same tool 20, typically including grinding of the contact surface 96 and subsequent grinding of the internal and external flank surfaces 94 and 98. mounted on. It is also possible to grind flank surfaces 98 and 94 before grinding contact surface 96. If flank surfaces 98 and 94 are ground first, then a final grinding operation will return contact surface 96 to its desired width and shape. It should be clear that when using the subject tool the total amount of material removed during the grinding operation is very small.

If all intake and exhaust valve seats on the engine are to be ground, a similar guide 42 is inserted from each valve seat in the engine head so that all valve seat surfaces of each type can be ground with the same abrasive material on the tool. It is expected that it will be placed so that it extends outward. This is, for example,
This means that all the bearing surfaces of the valve seat associated with the suction port are ground in one series of operations, and all the bearing surfaces of the valve seat associated with the exhaust port are ground in another series of operations. This also means that the engine can be pre-prepared to have all its valve seating surfaces ground in a minimum of time and with minimal changes to the grinding elements. Additionally, some valve seats may have only one or two seats that need to be ground, but the device can equally be used to grind them.

Figures 7-15 show details of several different configurations of polishing member 30. FIG. 7 shows an abrasive member 30A having a threaded hole 28 for engaging a screw 26 in a small diameter section 24 of the housing 22 and a locating surface or bore 31 for engaging a housing shoulder 27. The abrasive member 30A has a use surface, an annular tapered work-engaging surface 104, which is formed by coating the member 30A with a layer of diamond particles or cubic boron nitride particles in a binder. Made by applying a thin layer of hard, wear-resistant material. Many different types of cubic boron nitride are commercially available and are particularly suitable for use in the subject polishing members, including microcrystalline cubic boron nitride.

A work-engaging abrasive surface 104, shown in greater detail in FIGS. 8 and 9, extends around the circumference of the abrasive surface 104 between a plurality of radially curved abrasive surface regions 106 and adjacent regions 106. formed by a radially curved groove 108 separating the two. Although the grooves 108 are illustrated as uniformly spaced and of uniform width along their length, this is because the polishing area 106 between them becomes progressively wider from its radially inner side to its radially outer edge. means. It is also possible to create a region 106 of uniform width, in which case the groove 108 becomes progressively wider from its inner end to its outer end. This groove 108 serves as a path for the removal of material during grinding and also facilitates the circulation of lubricant during the grinding operation. However, because surface 104 is formed by applying a layer of very hard wear-resistant particles, it undergoes little or no wear and remains true and accurate in shape even after repeated use. , can be used to grind many valve seat surfaces without any need for reshaping, and usually provides accurate grinding without any need for a preliminary roughing process. Providing grooves 108 also aids in a more even distribution and increase in grinding speed, circulation of lubricant, removal of chips or debris, and is useful for continuous annular polishing surfaces, such as previously known devices or non-grooved polishing surfaces. This results in highly desirable operating conditions not available with other systems. In FIG. 7, polishing surface 104 is shown oriented at 60° relative to the axis of member 30A.

FIG. 10 shows an alternative form of abrasive member 30B similar to member 30A in most respects except that the annular abrasive surface 110 is oriented at a 75° angle to the axis of the element. In a typical valve seat grinding procedure, this element 30B would be used to grind an external valve seat flank such as the surface 98 of FIG. 16 if it were at a 75° angle to the axis. .

FIG. 11 shows the annular surface portion 96 of the valve seat shown in FIG. 16.
Similarly, the angular orientation of the annular polishing surface 112 is oriented at 45° to the axis to grind the member 30A.
and 30B, a polishing member 30C is shown.

FIG. 12 is similar to FIG. 8 but with adjacent grooves 11
4 and another special configuration of the polishing region 116 are shown. In embodiment 30D, grooves 114 and adjacent polishing regions meet along straight edges oriented at an angle to the radius of the device. In this configuration, the groove 114 is shown to be of uniform width along its length, with the polishing area being narrowest at its inner periphery and widest at the outer periphery of the polishing surface. This configuration has many of the same advantages as the configuration described above in connection with FIGS. 8-11. but,
Curved grooves have been found to be preferable to straight grooves in some cases.

FIG. 13 shows yet another configuration 30E in which grooves 118 extend radially outwardly between adjacent polishing surfaces 120. Although this configuration has some manufacturing advantages, it is often not preferred over the configurations described above.

14 and 15 are views of yet another embodiment 30F of abrasive member in which separate abrasive surfaces 122
and 123 are shown oriented at 30° to its axis and are formed by overlaying in the same manner as the polished surfaces described above. The polishing surfaces 122 and 123 are separated from each other by non-overlapping regions 124 and 125, and the edges of the overlapping regions are formed by surface grooves 126, 1 arranged in pairs as shown.
27, 128 and 130, grooves 126 and 12
One pair of grooves 128 and 130 are located on opposite sides of polishing surface 122 about 60° apart, and the other pair of grooves 128 and 130 are about 120° apart.
They are located on both sides of the polishing surface 123 at a distance. Groove 12
This arrangement of 6, 127, 128 and 130 reduces the possibility of chatter and creates a very accurate valve seating surface. Between groove pairs 126 and 127 and groove pair 128
The bisectors of and 130 need not be diametrically opposed as shown, nor should they be, but rather offset by some angle, e.g. an angle between 5° and 10°. is preferable. The number of grooves in each or both groove sets can be increased if desired, for example, by adding grooves that extend across polishing regions 122 and 123.

Although in all cases the grooves formed in the polishing surface are made relatively shallow and rounded, the edges of the grooves can also be made with relatively steep side edges. Although this groove, like the adjacent abrasive surface, can be painted with abrasive particles, in some cases for manufacturing economy it may be desirable to mask the groove to reduce the amount of abrasive material required. The transverse holes through all of the various abrasive members disclosed are preferably the same so that the same tool 20 can be used to mount and drive all of the various embodiments, and the direction of the threads of the various transverse holes is preferably the same. should be chosen such that the grinding pressure is applied in the direction of clamping the abrasive member to the tool.

There has thus been shown and described a novel valve seat grinding tool and abrasive member for use therewith, including various embodiments of the abrasive member, which meet all of the objectives and benefits sought. However, it will be apparent to those skilled in the art that many changes, variations, modifications, and other uses, embodiments, and applications of the subject device in addition to those disclosed are possible. All such changes, variations, modifications, and other uses, embodiments, and applications that do not depart from the spirit and scope of the invention are included in the invention, which is limited only by the scope of the foregoing utility model claims. I consider it.

[Brief explanation of the drawing]

Figure 1 shows part of the cylinder head and one of its valve seats.
FIG. 2 is a perspective view showing a state in which a grinding device is being ground by a grinding device including a grinding member constructed according to the present invention and a support device for the grinding member. FIG. 2 is a cross-sectional view of the subject valve seat grinding tool with an abrasive member attached and cooperating with a guide member. FIG. 3 is a front view of the portion of the tool of FIG. 2 used to couple to a power source. 4 is a right side view of the coupling member of FIG. 3; FIG. Fifth
The figure is an exploded view of the subject tool. FIG. 6 is a front view of a guide member for use with the subject tool. 7th
The figure is a cross-sectional view through the center of an abrasive member for use in the subject tool. 8 is a right side view of the polishing member of FIG. 7. FIG. FIG. 9 is an enlarged cutaway view of a portion of the polished surface of the member of FIGS. 7 and 8. FIG. 10 and 11 are cross-sectional views of other valve polishing members similar to those shown in FIGS. 7 and 8, but having different workpiece engaging surface angles. FIG. 12 is a view similar to FIG. 8, showing an alternative configuration of the grooves adjacent to the separate polishing surfaces. Figure 13 is another diagram similar to Figure 8,
FIG. 7 illustrates yet another configuration of separate workpiece-engaging abrasive members and grooves. FIG. 14 is a cross-sectional view through the center of yet another abrasive workpiece engaging member. FIG. 15 is a right side view of the member of FIG. 14. FIG. 16 is an enlarged cut-away cross-sectional view through the center of an engine valve seat with the surface to be ground by the subject apparatus. 20...Grinding tool, 22...Cylindrical housing, 24...Small diameter end, 26...Screw, 27...
Shoulder, 28... Screw, 30... Polishing member, 31...
Hole boring, 32, 34... Bearing assembly, 36... Tubular member, 37... Annular space, 38... Cylindrical inner surface, 40... Cylindrical end, 42... Guide member, 4
4... end, 46... workpiece engagement surface, 48... coupling member, 50... hexagonal head, 52... main body,
56... Hexagonal cavity, 58... Housing closing member, 78... Valve seat, 94, 96, 98... Valve seat surface, 100... Valve guide, 104... Workpiece engagement ground surface, 106... Grinding surface area, 108...Groove, 1
14...Groove.

Claims (1)

[Claims for Utility Model Registration] (1) A cylindrical polishing member 30 for polishing the valve seat to be polished is coaxially attached to the lower end, and detachably connected to the drive part of the rotational drive source at the upper end. A rotary drive shaft 48 is coaxially fixed to the outer cylindrical housing 22 and is coaxially fitted into the outer cylindrical housing 22 via bearings 32 and 34, thereby causing the cylindrical housing 22 to move relative to each other. Rotatably bearing inner tubular member 3
6 and the coaxial through hole provided in the lower end of the outer cylindrical housing 22 and the coaxial through hole provided in the polishing member 30 are fixedly fitted coaxially to the lower end portion of the inner tubular member 36, and the coaxial through hole provided in the polishing member 30 is spaced apart from each other. A guide member 40 that extends downwardly through the guide member 40 to be fitted into a valve opening of a valve seat to be polished. (2) In the valve seat polishing tool according to claim 1 of the utility model registration claim, the polishing member 30 has a conical polishing surface at the lower end of the peripheral wall thereof, and the conical polishing surface has approximately equal parts in the radial direction. A valve seat polishing tool characterized in that grooves are provided at intervals and polishing portions are formed between the grooves. (3) In the valve seat polishing tool according to claim 2 of the utility model registration claim, the width of the groove is gradually increased, thereby making the width of each polishing portion of the conical polishing surface uniform. A valve seat polishing tool characterized by: